Pavement.



W. JOHNSON.

mvmem.

l APPLICATION FILED MAVZ, 1917. lig@ man@ 5m. m18.

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lttdthil ril WVAEREB JOHNSN, 0E NEW ELENS, LUS''ANA.

.application e May 21, lill?.

Be Vit known that l., i WARREN Jorrnson, a citizen ot' the United States, and a resident of New Orleans, in the parish ot Orleans and State of Louisiana, have invented newv concrete, having interlocking tongues and grooves, and having openingsthrough which grouting may be poured afteithe slabs are laid Ito provide points of support torthe slabs.

y ln the drawings:

Figure l is a plan View of the improved pavement;

Fig. if: is a vertical section;

F ig. 8 a perspective View of one of the slabs;

'iligl l is a sectional View showing the edge the parement;

5 a perspective view oli one corner oi a modiied form of slab.

ln. the present embodiment ot the invention, the pavement is composed ot a series oit slabs l., each of which is provided at one side edge with a depending :rib having a longitudinally outer 'aoe, and at the opposite side edge each slab has a tongue l shaped to lit the groove oit the adjacent block. his tongue, as shown, is roiindeoiias is-also the groove, and it will be evident that ley prying up a. pair of slabs at the tongue and groove edge the slabs may be sepa vated Without rupturing the tongue or the rih. Each slab is also provided with a series oi openings 5 tor peimitting the passage ot grouting after the slabs have neen laid, and cach block is also reinforced by a sheet of Wire mesh 6, the said sheet being at the center ot the slab, and it; Will he noticed upon inspectioniot atiiFig. 2 that the sheet'extends into the rib -2 and the tongue 4l.

lin laying the improved pavement, the surface of the ground is leveled. as indicated at 7, and stakes 8 are set, the said stakes having their tops at the pavement level. The slabs are laid on the stakes, tongues being engaged with the grooves, after which grouting is poured down through the openings 5, as shown in Fig. 9 and the said grouting will spread, forming a firm sup- -port for the slabs. lit will be noticed that Speciicatione Letters Patent.

extending groove 3 on its.

lzatented dan. to, Mdel..

Serial lilo. 170,055.

there is a row of openings 5 at each edge ot the slab andA onevacioss' the center. At

the edges of the pavement, the outermost. slabs la, instead of having grooves or ribs at their outer edges, have aodepending portion 9, .and the groiiting poured through the openings 5 at this point will 'till in the space on the inner side of the depending rib 9,

thus making a smooth, neat finish at this point.

ln Fig. 5 the slab l() has spending to the ribs 2 at two adiacent side tivo other side edges, and the ribs ll have the grooves 12 corresponding to the grooves 3 for receiving tongues of the adiaoent slalo.

poured into these openings will lill in thespaee between the under side'ot the slahs and the surface of the ground, givinga bearing at frequent intervals so as to main tain tlie'level at which the slabs are laid, and when the slabs are laid on 'an incline the grouting Will prevent creeping.

AThe engagement of the tongue and groove prevents the slabs getting out of alineraent at the joints, and in oase of general settlement relining is permitted.

The improved slab may be made from Portland cement, mortar, or concrete, which may be mixed Witline gravel, broken rock or the like, and reinforced with Wire mesh, the dimensions of the slab being of a. size to Jfacilitate handling.

l claim:

l. A pavement composed et slalis molded of plastic material capable et hardening, 'each slab having at one edge a depending rib grooved on its outer face, and at the other an outwardly extending tongue adaptedto engage the groove' of an adjacent slab, each slab having openin gs near its edges and intermediate the said edges for permitting grouting to be poured after the slabs are laid, the tongues being rounded-and the the ribs ll coriel iedges, the tongues. (not shown) being at the rib grooved on its outer face, and at the other an outwardly extending-tongue adapt- A to engage the groove of an udjeeentslah, l

each slab having 4openings neerits. edges 'A and intermediate the said edges for permitver" plastic material capable of hardening,

the Slabsheving at their side edges interlocking tongues' and grooves, and e series of transverse openings for permitting grout'uig to he poured through the openings to form supporte` for the slabs, said tongue and groove connecion depending below the level of the under surface of the slabs and said slabs having their edges abutting 'to above the tongue and groove connection.

` fi. A pavement composed of slabs molded mesmo of plesrio material capable of hardening, the slabs having et their side edges interlocking tongues und grooves, and n series of transverse openings for permittinggrouting to bepoured through the openings izo form supports for the slabs.

5. The process of constructing a pavement which comprises providing reformed slabs having holes therein, setting stakes With their upper ends at u regulated height, supportingsnid slabs upon said stakes with their edges in Contact und pouring groui, through said holes So that said grout will spread bene-:1th said slabs to 'forni perinanent supports for the pavement and also fill seid openings.

' 'WARREN JOHNSON. 

